Border Patrol arrests at the southern border have fallen to their lowest sustained level in more than 50 years, yet the agency's surveillance footprint on U.S. highways is expanding rather than shrinking. With fewer people crossing at the physical line, resources and technology are increasingly pointed at drivers hundreds of miles from Mexico.
For commuters, delivery drivers and small-business owners near the southern border — and even in cities like Chicago, Houston and Detroit — the checkpoint is no longer just at the line. It can show up on the interstate, far from any port of entry.
Key Takeaways
- Southwest border apprehensions have held under 10,000 a month since February 2025, the lowest sustained level in more than 50 years of federal tracking, and fiscal year 2026 is on pace to record the fewest Border Patrol apprehensions since 1967.
- An Associated Press investigation traced a hidden license-plate camera network reaching more than 120 miles inland, beyond the roughly 100 miles the agency is normally authorized to cover.
- At fixed checkpoints, agents can only ask brief citizenship questions unless they can show reasonable suspicion or probable cause for anything more.
For years, Border Patrol's public identity centered on steel and concrete: new wall segments, floodlights and razor wire strung along the Rio Grande and the Arizona desert. That infrastructure has not vanished, but the center of gravity has shifted. With crossings near historic lows, the highway checkpoint system the agency has long called its third layer of enforcement — positioned on roads leading away from the border rather than at the line itself — is now doing more of the daily workload than it has in decades, simply because so few people are being caught crossing in between.
A Camera Network That Reaches Deep Into the Interior
The clearest evidence of that shift came from reporting that traced a license-plate reader system Border Patrol has quietly built over roughly the past decade. Cameras disguised inside traffic cones and roadside barrels scan passing vehicles, feeding a predictive algorithm that flags cars by where they came from, where they are headed and which route they took — sometimes prompting a call to local police to make the stop.
Drivers are often pulled over for unrelated reasons — a burned-out light, tinted windows, an air freshener blocking the view — before being questioned about their travel. In one documented case, the network included at least four cameras around Phoenix, one of them more than 120 miles from Mexico. Other cameras turned up in the Detroit area and near the Michigan-Indiana line, aimed at traffic bound for Chicago. Police departments in Texas have separately pushed Border Patrol to run facial recognition against drivers, according to internal records reviewed by reporters.
CBP has responded by insisting the technology helps identify threats and dismantle smuggling networks, and that its use is bound by strict internal rules, federal statutes and constitutional limits, though the agency won't describe specific missions, citing national security. Legal scholars, including a George Washington University law professor who reviewed the findings, argue that always-on tracking of ordinary drivers raises Fourth Amendment questions the courts have only begun to confront.
Which Highways Are Affected
Fixed, marked checkpoints are only part of the story; the network of highways they sit on matters just as much. In Texas, the busiest example sits on Interstate 35 roughly 29 miles north of Laredo, funneling both commercial and passenger traffic toward San Antonio. In Arizona, a similar station operates on Interstate 19 south of Tucson, with additional stops along Interstate 10 across the southern stretches of both states. Separately, and far outside that southwestern corridor, the AP's hidden-camera network extends to highways feeding Los Angeles, Houston and San Antonio from the border region, and, hundreds of miles north, to routes into Chicago and Detroit.
For residents and business owners who travel those corridors for supply runs, family visits or daily commutes, that geography means an ordinary trip can trigger secondary screening — even for U.S. citizens with no immigration issue at all.
What Agents Can and Can't Legally Ask
At a fixed, marked checkpoint, agents may ask brief questions to verify citizenship and visually inspect a vehicle's exterior without needing any individualized suspicion. Extending that stop — to search a trunk, question passengers at length or hold someone past a few minutes — requires a higher legal bar. Away from fixed checkpoints, so-called roving patrols need individualized, reasonable grounds to suspect an immigration or other federal violation before pulling a car over at all, and under longstanding guidance from the ACLU of New Mexico, "reasonable suspicion is more than just a 'hunch.'" Searching a vehicle's interior requires either consent from the driver or a separate finding of probable cause. Drivers and passengers can ask agents whether they are free to leave, and if the answer is no, they are entitled to know why. Recording the interaction is generally legal everywhere except on federal property at an official port of entry.
The Legal Fight Is Spreading Beyond the Border
The legal fallout is no longer confined to border states. In June 2026, motorists sued Westchester County, New York, over a 600-camera license-plate network that had funneled roughly 1.6 billion vehicle captures to dozens of outside law-enforcement agencies, immigration authorities among them — a case that traces directly back to the AP's reporting on the Border Patrol program. California's attorney general has separately sued a Southern California city for violating the state's law restricting how license-plate data can be shared with outside agencies. With roughly $2.7 billion in new federal funding earmarked for border-surveillance technology and crossings unlikely to rebound soon, the interior camera and checkpoint network appears likely to keep growing — and the courtroom fights over where the 100-mile border zone effectively ends look far from settled.
